Analysis of the test principle of the marble burst method and the elastic diaphragm method of the burst strength tester

The bursting strength tester is used to test the bursting strength of textiles. It is a test equipment independently developed and produced by our company (Hong Kong) Co., Ltd. The marble burst method and the elastic diaphragm method are commonly used test methods for burst strength testers. The R&D technical engineer will describe the test principles of these two test methods in this article. Marble Burst Method: Marble Burst Strength Tester uses a pair of brackets to replace the upper and lower grippers of the electronic fabric strength tester. The upper bracket and the lower bracket can move relative to each other to fix the sample in the cloth ring. When the lower support descends at a certain speed, the marbles on the ejector rod vertically push the sample until the sample is burst, and the instrument automatically displays the bursting strength and bursting elongation value. Elastic diaphragm method: A fabric sample of a certain area is placed between the pressure cover and the air pressure box, and a rubber pad (elastic diaphragm) of appropriate thickness and good toughness is placed under the sample, and a ring clamp of a specified size is used to clamp it. live. Turn on the liquid inlet switch and slowly increase the fluid pressure under the diaphragm until the specimen ruptures. Read the burst strength value from the hydraulic pressure gauge, and read the burst elongation of the sample at the time of bursting on the extensometer. Test operation: 1. marble bursting method ①, start the preheating for 30 minutes, and select the bursting function in the reset state. Set the margin and positioning shift (the margin is the distance from the outer circle of the mandrel to the inner circle of the gripper, and the positioning shift is to collect the strength value at the set elongation, for geotextiles). ②, press“experiment”Press the key, put the sample into the cloth clamping ring and tighten it, and then lay it flat on the cloth clamp (the cloth clamp should be pushed to the bottom). ③, press“stretch”Press the key to start the test. After the sample is completely broken, the lower gripper automatically returns to the initial position, and the display screen displays various data. ④. Repeat the above steps to measure 5 samples. If the sample is not clamped tightly, it will slip out of the ring, or if the burst deformation of the sample is too large, the phenomenon that the sample will not burst will occur. At this time, the test results are invalid, and another sample should be replaced to re-test. ⑤. After the test is completed, the instrument automatically records and counts all the data. ⑥、Clear the data and prepare for the next test. 2. Elastic diaphragm method 1. Check and calibrate the instrument: check whether all parts of the instrument are normal; if necessary, the comprehensive performance of the instrument can be checked with a standard diaphragm; when the elastic diaphragm is obviously deformed, it must be replaced (in the absence of samples) Then, expand the diaphragm to a certain height, observe the shape of the diaphragm, if there is a significant difference with the normal spherical cap shape, the diaphragm should be replaced). ②. Clamping the sample: Cover the sample on the diaphragm, in a flat and tension-free state, and then clamp the sample with a ring clamp. When pressurizing, prevent the specimen from being damaged by the grips. 3. Pre-test: Before the test, two additional pre-samples should be used for pre-test to observe whether it is completed within the specified time range under the action of gradually increasing hydraulic pressure until the rupture occurs (generally, the fabric is specified as 30s).±10s; wool fabric is specified as 15s±10s). If not, the pressurization rate can be adjusted to make the average burst time within the specified range. ④. Formal test: Use the adjusted pressure rate to test the samples one by one, and record their burst strength and burst expansion. If the specimen ruptures at the edge of the grip ring, another specimen shall be taken and redone. ⑤, Diaphragm correction number: use the same liquid speed as the above test, clamp the diaphragm with a clamp without a sample, and the pressure required when the diaphragm expands to the average burst expansion of the above sample is the diaphragm Correction number.

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